Answer:The energy of the molecules in the computer decreases.
Explanation:LET ME KNO IM WRONG
Answer: The energy of the molecules decrease in the computer
Explanation:
This is because you turned off the computer cooling it down and slowing the molecules.
The first excited state of Ca is reached by absorption of 422.7 nm light. Find the energy difference (kJ/mole) between the ground and first excited state. Watch your units. A. 2.83 x 10-7 B. 4.70 x 10-22 C. 283 D. 4.70 x 10-19 E. 457
For the excited state of Ca at the absorption of 422.7 nm light,the energy difference is mathematically given as
E= 4.70x10-22 kJ/mol
What is the energy difference (kJ/mole) between the ground and the first excited state?Generally, the equation for the Energy is mathematically given as
E = nhc / λ
Where
h= plank's constant
h= 6.625x 10-34 Js
c = speed of light
c= 3x 108 m/s
Therefore
E = 1*(6.625x 10-34 Js)( 3x 10^8 m/s) / ( 422.7x10^-9)
E= 4.70x10-22 kJ/mol
In conclusion, Energy
E= 4.70x10-22 kJ/mol
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The blood carries nutrients to where they are needed. True False
Answer:
True
Explanation:
Answer:
true
Explanation:
One way to identify the type of radioactive decay produced in a reaction is to pass the emission through an electric field. Describe the type of radioactive emission produced from the decay of uranium-
238 to thorium-234 and its reaction to the electric field
Decay of Uranium-238 produces gamma radiaton whereas decay of thorium-234 releases beta radiation.
What type of radiation is produced?In the decay of U-238, two gamma rays of different energies are emitted in addition to the alpha particle while on the other hand, in the decay of thorium-234 , beta rays are emitted.
So we can conclude that decay of Uranium-238 produces gamma radiaton whereas decay of thorium-234 releases beta radiation.
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A soil sample of 2.65g was analyzed and found to contain 0.0625mg of Ca2+ and 2.45*10^-3g of Mg2+.Classify each analyte based on its level in the soil sample
Based on the milligram per Kg of soil sample of each analyte, calcium ion, Ca2+ and magnesium ion, Mg2+ are both classified as macronutrients.
What are soil nutrients?Soil nutrients are minerals which are found present in the soil and which are required by plants for their growth and development.
Soil nutrients can be classified based on amount needed by plants as well as the amount present in the soil into:
micronutrients- present in small amounts (<100 mg/kgmacronutrients- present in relatively larger amounts (>100 mg/kg)The mg/Kg of each analyte in the soil sample is as follows:
mass of soil sample = 2.65 g = 0.00265 kg
Calcium ion:
amount per mg/Kg of soil sample = 0.625mg/0.00265 kg
amount per mg/Kg of soil sample = 236 mg/kg
Magnesium ion:
0.00245 g = 2.45 g
amount per mg/Kg of soil sample = 2.45 mg/0.00265
amount per mg/Kg of soil sample = 924 mg/Kg
Therefore, calcium ion, Ca2+ and magnesium ion, Mg2+ are both classified as macronutrients.
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HELP ME OUT PLS!!!!!!!!!!!!!
I. Car metal rusting slowly for a year.
II. Condensation of water vapor on a mirror during a 5-minute shower.
III. The formation of a precipitate in a test tube during a 10-second reaction.
IV. The oxidation of copper on the Statue of Liberty for more than 100 years.
23) Which of the processes above are examples of a chemical reaction?
A) I and II
B) III and IV
C) I, II, and III
D) I, III, and IV
Answer:
d) I, III, and IV
Explanation:
rust, copper oxidation, and percipitate from a chemical reaction are all, well, chemical reactions.
1) Complete the equation triangles or write out the equation. Annotate them with the units for each value.
(a) The equation linking frequency, wave speed and wavelength (Vampires Frighten Waves)
Help me pls
A) wave speed = frequency x wave length
B) Time period = 1/frequency
C) Power = work done/ time taken
D) Kinetic energy = 0.5 x mass x velocity^2
E) Ep = mass x gravitational field x height
F) Ee = 0.5 x spring constant x extension^2
Hope this helps!
H2S what species are present at 10-6 mol/L or greater when dissolved in water
Answer:
the answer has been given below have a good day
Explanation:
mark as brainiest
The species are present at 10-6 mole/L or greater when dissolved in water is when in solutions, weak acids and bases partially ionize.
What is ionization?Ionization is defined as anything that causes electrically neutral atoms or molecules to gain or lose electrons in order to become electrically charged atoms or molecules (ions). One of the main mechanisms by which radiation, including charged particles and X-rays, transmits their energy to matter is ionization. An anion is created when an atom or molecule picks up an electron; a cation is created when they lose an electron.
Weak Acids and Weak Bases Ionizing. Numerous acids and bases are weak, meaning they do not completely ionize in aqueous solution. The nonionized acid, hydronium ion, and conjugate base of a weak acid are all mixed together to form a solution in water, with the nonionized acid being present in the highest concentration.
Thus, the species are present at 10-6 mole/L or greater when dissolved in water is when in solutions, weak acids and bases partially ionize.
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Balance the N-14(d,n) nuclear equation for radioisotope production in PET. This means to
write it out in equation form with 2 reactants and 2 products.
Which is the correct step(s) for this reaction mechanism?
O NO2 + CO2 + CO NO + CO2
O step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
O step 1: NO + NO3-NO + NO3 (slow)
step 2: NO3 + CO → NO + CO2 (fast)
O step 1: 2N02 + NO 2NO + NO3 (slow)
step 2: NO3 + CO → 2NO2 + CO2 (fast)
The reaction mechanims shows the sequence of steps through which a reaction occurs. The reaction mechanism for this reaction is;
step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
What is reaction mechanism?We have to note that not all reactions occur in a single reactive encounter. If a reaction occurs in a single reactive encounter then it is called an elementary reaction.
The reaction mechanim shows the reaction sequence of a non elementary reaction. The correct mechanims of this reaction is shown as;
step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
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Many aerosol cans have warning labels on the side
that say to keep away from heat and fire. Why?
Answer:
Aerosol cans are pressurized, High temperatures increase the pressure in an aerosol can, potentially to the point of explosion.
Nitric acid (NO) reacts with oxygen gas to form nitrogen dioxide (NO2), a dark brown gas:
2NO(g) + O2(g) → 2NO2(g)
In one experiment, 0.886 mole of NO is mixed with 0.503 mol of O2.
Calculate which of the two reactants is the limiting reagent. (5 points)
Calculate also the number of moles of NO2 produced. (5 points)
What reactant is left over and how much of it is left over? (5 points)
Answer:
Lim reag = NO .07 mole of O2 left over
Explanation:
From the equation, you need twice as many moles of NO as O2
2 x moles O2 = 2 * .503 moles = 1.06 moles of NO needed....you do not have enough so this is the limiting reagent O2 will be left over
1/2 * .866 = .433 moles of O2 used .503 - .433 = .07 mole O2 leftover
What must happen for a nuclear reactor to make electricity
Answer:
They contain and control nuclear chain reactions that produce heat through a physical process called fission. That heat is used to make steam that spins a turbine to create electricity
Explanation:
Which of the following will oxygen react with to cause combustion?
O A. A hydrocarbon
O B. Heat
O C. Carbon dioxide
O D. Water
HELP
Answer:
hydrocarbon
Explanation:
it reacts with oxygen to produce water and carbon dioxide.
hope this helps.
N2+3H2 → 2NH3
A) How many grams of NH3 can be produced from the reaction of 28g of N2 and 25g of H2?
I need the steps to the answer 34g
B) How much of the excess reagent is left over?
I need steps to the answer 19 g
Explanation:
N2 (g) + H2 (g) gives out NH3 (g)
Now balance it. You have two reactants with compositions involving a single element, which makes it very easy to keep track of how much is on each side. I would balance the nitrogens, and then the hydrogens.
Now balance it. You have two reactants with compositions involving a single element, which makes it very easy to keep track of how much is on each side. I would balance the nitrogens, and then the hydrogens.(If you balance the hydrogen reactant with a whole number first, I can guarantee you that you will have to give NH3 a new stoichiometric coefficient.)
N2 (g) + 3H2 (g) gives out 2NH3 (g)
The stoichiometric coefficients tell you that if we can somehow treat every component in the reaction as the same (like on a per-mol basis, hinthint), then one "[molar] equivalent" of nitrogen yields two [molar] equivalents of ammonia.
Luckily, one mol of anything is equal in quantity to one mol of anything else because the comparison is made in the units of mols.
So what do we do? Convert to
mols (remember the hint?).
28g N2 × 1 mol N2/ 2 × 14.007) g N2
= 0.9995 mol N2
At this point you don't even need to calculate the number of mols of H2 . Why? Because H2 is about 2 g/mol, which means we have over 10 mols of H2. We have 1 mol N2, and we need three times as many mols of H2 as we have
N2.
After doing the actual calculation you should realize that we have about 4 times as much H2 as we need. Therefore the limiting reagent is clearly N2.
Thus, we should yield 2×0.9995=1.9990 mols of NH3 (refer back to the reaction). So this is the second and last calculation we need to do:
1.9990 mol NH3 × 17.0307 g NH3/ 1 mol NH3
= 34.0444 g NH3
Hope it helpz~
34grams of NH₃ can be produced from the reaction of 28g of N₂ and 25g of H₂ and 19g of the excess reagent is left over.
What is Mole?The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Mass of N₂ = 28g
Mass of H₂ = 25g
Moles of N₂ = mass / molar mass
= 28 / 28
= 1 mole
Moles of H₂ = 25 / 2
= 12.5 moles
Since the number of moles of N₂ is lesser, the amount of products formed depends on the moles of N₂.
From the reaction,
1 mole of N₂ gives 2 moles of NH₃
So, Mass of NH₃ in 2 moles = 2 × 17
= 34g
B) From the reaction,
1 mole of N₂ reacts with 3 moles of H₂.
The number of Moles of H₂ left = 12.5 - 3
= 9.5 moles
Mass of excess reagent left = moles left × molar mass of H₂
= 9.5 × 2
= 19g
Therefore, 34grams of NH₃ can be produced from the reaction of 28g of N₂ and 25g of H₂ and 19g of the excess reagent is left over.
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What is the effect of pressure on the volume of a gas? *answers*
(Reflect on the laboratory experiment)
Answer:
The Relationship between Pressure and Volume: Boyle's Law
As the pressure on a gas increases, the volume of the gas decreases because the gas particles are forced closer together. Conversely, as the pressure on a gas decreases, the gas volume increases because the gas particles can now move farther apart
Why is the r.a.m. value used?
A. The r.a.m. value is used to determine how many isotopes an element has.
B. None of these
C. Atoms are too small for their masses to be measured directly.
D. A single atom cannot be isolated, so only the average size of a group of atoms can be measured.
Answer:
I think the answer is going to be d A single atom cannot be isolated, so only the average size of a group of atoms can be measured. :)
Have an amazing day!!
Please rate and mark brainliest!!
Answer: A. The r.a.m. value is used to determine how many isotopes an element has.
Explanation: Founders Educere Answer
I love you fellow summer school students, good luck.
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what is the net ionic equation for the reaction that occurs when magnesium carbonate (s) and excess hydroiodic acid are combined
Answer:
2H+(aq) + 2Br-(aq) + Mg2+(aq) + S2–(aq) = Mg2+(aq) + 2Br-(aq) + H+(aq) + HS-(aq)
13. Subtract 0.291 from 0.4
Answer:
0.109
Explanation:
0.4-0.291=0.109
Determine the mass of the following samples
3 moles of Mg
4.2 moles of NaCI
Answer:
See below
Explanation:
From periodic chart
Mg = 24.305 gm per mole
24.305 * 3 = 72.915 gm
Na = 22.989
Cl = 35.45 summed = 58.439 gm per mole
58.439 * 4.2 = 245.4438 gm
If 4.0 L of a 4.6 M SrCl2 solution is diluted to 45 L , what is the molarity of the diluted solution
If 4.0 L of a 4.6M SrCl2 solution is diluted to 45L, the molarity of the diluted solution is 0.41M.
How to calculate molarity?The molarity of a diluted solution can be calculated using the following formula:
M1V1 = M2V2
Where;
M1 = initial concentrationM2 = final concentrationV1 = initial volumeV2 = final volumeAccording to this question, 4.0 L of a 4.6M SrCl2 solution is diluted to 45L, the molarity of the diluted solution is calculated as follows:
4.6 × 4 = 45 × M2
18.4 = 45M2
M2 = 18.4/45
M2 = 0.41M
Therefore, if 4.0 L of a 4.6M SrCl2 solution is diluted to 45L, the molarity of the diluted solution is 0.41M.
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A few million years ago, volcanic eruptions caused a large region to be covered by lava. The lava eventually cooled, which resulted in the formation of large amounts of igneous rock. Most of the rock formed was basalt. Today, this region is covered by soil, most of which is a soil known as laterite. Which geologic process caused the rock to change into soil?
A.
deposition
B.
erosion
C.
transportation
D.
weathering
Answer:
D
Explanation:
weathering is the breaking down of physical components through unfavorable weather conditions which can likely cause a change in physical properties
What is the mass of 3.011 x 1023 atoms of Ca ?
Answer:
2g is the answer
Explanation:
based on google
25.88 grams of tin (ll) phosphate reacts with 31.73 grams of zinc.
a write a balanced chemical equation
b. what is the limiting reactant?
c. What is the excess reactant and how many moles of it are left over?
d. How many grams of of the products are produced? (2 answers)
Explanation:
Zn + Sn3(PO4)4 = Zn3(PO4)2 + Sn - Balanced Chemical Equation
4.3 is limiting
is the answer
if you like my answer please like comment and mark me as brilliant
Moles to mass
HELP PLEASE
15 pts
Explanation:
nose amigo, la verdad yo también tengo dificultades escolares muchísimas gracias, Dios te bendiga en otro idioma por cierto mi anime favorito es cowboy beboop
HCl(?) + H2O(?) → H3O+(?) + Cl-(?)
What is the phase label on Cl-?
Answer:
H30,+ion is known as Hydroniom Ion
Explanation:
brain ly ----
everyday
brainless this answer is correct
Will a precipitate form if you mix 75.0 mL of a NaOH solution with pOH of 2.58 if it is mixed with 125.0 mL of a 0.0018 M MgCl2 solution
A precipiatate of mass 0.013 g is formed when you mix 75.0 mL of a NaOH solution with pOH of 2.58 and 125.0 mL of a 0.0018 M MgCl2 solution
What is stoichiometry?In stoichiometry, calculations are made based on mass - mole or mole - volume relationships. First we must put down the balanced reaction equation; 2NaOH(aq) + MgCl2(aq) -----> Mg(OH)2(s) + 2NaCl(aq)
Now Ionically;
2OH^-(aq) + Mg^2+(aq) -----> Mg(OH)2(s)
Concentration of OH^- = Antilog (-2.58) = 2.6 * 10^-3 M
Number of moles of OH^- = 2.6 * 10^-3 M * 75/1000 = 0.000195 moles
Concentration of Mg^2+ = 0.0018 M
Number of moles of Mg^2+ =0.0018 M * 125/1000 = 0.000225 moles
Since;
1 mole of Mg^2+ reacts with 2 moles of OH^-
x moles of Mg^2+ reacts with 0.000195 moles of OH^-
x = 0.0000975 moles
Mg^2+ is the limiting reactant.
1 mole of Mg^2+ yields 1 mole of the precipitate
0.000225 moles of Mg^2+ yields 0.000225 moles of precipitate.
Hence, a precipitate is formed.
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What is ostwald process?? Give the first catalytic reaction of this process. .
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Answer: Smelling salts and oxygen are introduced into a metal catalyst-containing tube (platinum). Typically warmed to get the reaction started. The alkali is then oxidized to produce nitric oxide.
Answer:
The Ostwald process is a chemical process used for making nitric acid. Wilhelm Ostwald developed the process, and he patented it in 1902. The Ostwald process is a mainstay of the modern chemical industry, and it provides the main raw material for the most common type of fertilizer production
Explanation:
The first stage of the Ostwald process involves the catalytic oxidation of ammonia into nitric oxide, using platinum as the catalyst. The nitric oxide is then transferred to a different oxidizing tower, where it is oxidized into nitrogen dioxide
Convert the answer from #7 to kg. Use the correct significant figures.
Answer:
Socratic app
Explanation:
it will help you
2. A 0.2719 g sample containing CaCO3 reacted with 20.00 mL of 0.2254 M HCl. Given that HCI was excess. The excess HCl required exactly 20.00 mL of 0.1041 M NaOH to reach the end-point using phenolphthalein indicator. Determine percentage purity of CaCO3 in the sample. The reraction involved is CaCO3(s) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l) The titration reaction is HC(aq) + NaOH(aq) NaCl(aq) + H₂O(1)
The calculated percentage purity of the original sample of calcium carbonate is 44%.
What is excess titration?In the back titration of the excess acid, we neutralize the excess titrand left in a system.
We have the reaction equation;
CaCO3 + 2HCl ----> CaCl2 + H2O + CO2
To get the moles of HCl = 0.2254 M * 20/1000 L = 0.0045 moles
The reaction involving the excess acid occurs thus;
HCl + NaOH ----> NaCl + H2O
Number of moles of NaOH = 0.1041 M * 20/1000 = 0.0021 moles
We have a 1:1 hence 0.0021 moles of HCl reacted also
Number of moles of HCl that reacted with CaCO3 initially = 0.0045 moles - 0.0021 moles = 0.0024 moles
Given the stoichiometry of the reaction, 0.0012 moles of CaCO3 reacted.
Hence;
Mass of pure CaCO3 in the sample= 0.0012 moles * 100 g/mol = 0.12g
Percent purity of the sample = 0.12g/0.2719 g * 100/1
= 44%
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If 10.0 moles of O₂ are reacted with excess NO in the reaction below, and only 8.0 mol of NO₂ were collected, then what is the percent yield for the reaction?
2 NO (g) + O₂ (g) → 2 NO₂ (g)
Answer:
Explanation:
General Remarks
The balance numbers are the same. (The balance numbers are 2 and 2)
The balance number in front of the O2 is 1.
So for every mole of O2 needed 2 moles of NO2 should be produced.
If 10.0 moles of oxygen is used, then you should get 20 mols of NO2 should be produced.
Formula
% yield = (what was produced / what should have been produced) *100
Givens
What was produced = 7 moles
What should have been produced = 20 moles
Solution
Substitute the givens into the equation
% yield = 8/20 * 100
% yield = 0.40 * 100
Answer: 40%
